Hybris 6.1 backoffice Advance search feature : Itemtypes coming in advance search are opening in new editor in hmc while the feature is not coming up in backoffice. Any suggestions ?

Hybris 6.1 backoffice Advance search feature Complex entities coming in advance search usually opens a new editor window in hmc. How do we implement the same in backoffice ? Currently in backoffice even for complex entities in advance search i am getting a dropdown with the objects.